/***
 * ASM Guide
 * Copyright (c) 2007 Eric Bruneton
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.googlecode.q2xml.model.asm;

import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
import static org.objectweb.asm.Opcodes.ALOAD;
import static org.objectweb.asm.Opcodes.INVOKESPECIAL;
import static org.objectweb.asm.Opcodes.RETURN;
import static org.objectweb.asm.Opcodes.V1_5;

import java.util.ArrayList;
import java.util.List;

import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.FieldNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.VarInsnNode;

import com.googlecode.q2xml.service.jdbc.Column;

/**
 * ASM Guide example class.
 * 
 * @author Eric Bruneton
 */
public class BeanGenerator
{

	/**
	 * 
	 * @param fullObjectName as pkg/Bean
	 * @param columns
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public byte[] generate(String fullObjectName, List<Column> columns)
	{
		ClassNode cn = new ClassNode();
		cn.version = V1_5;
		cn.access = ACC_PUBLIC;
		cn.name = fullObjectName;
		cn.superName = "java/lang/Object";
		List<String> interfaces = new ArrayList<String>();
		interfaces.add("java/io/Serializable");
		cn.interfaces = interfaces;

		//constructor
		{
			MethodNode mn = new MethodNode(ACC_PUBLIC, "<init>", "()V", null, null);
			cn.methods.add(mn);
			InsnList il = mn.instructions;
			il.add(new VarInsnNode(ALOAD, 0));
			il.add(new MethodInsnNode(INVOKESPECIAL, "java/lang/Object", "<init>", "()V"));
			il.add(new InsnNode(RETURN));
			mn.maxStack = 1;
			mn.maxLocals = 1;
		}
		
		for (Column column : columns)
		{
			cn.fields.add(new FieldNode(ACC_PUBLIC, column.getName().toLowerCase(), column.getType(), null, null));
		}
		
		ClassWriter cw = new ClassWriter(0);
		cn.accept(cw);
		return cw.toByteArray();
	}

}
